Bronchitis is an inflammatory reaction of the bronchial tubes and is usually classified as acute or chronic according to the course of the disease. The symptoms of acute bronchitis are: the onset of the disease may be characterized by symptoms of upper respiratory tract infection, such as nasal congestion, runny nose, sore throat, hoarseness, etc., accompanied by low-grade fever, fear of cold, malaise, coughing, and coughing up sputum easily. The cough may be triggered or aggravated by inhalation of cold air or irritating gases, and severe coughing may lead to nausea and vomiting, and pain in the chest muscles. Chronic bronchitis is characterized by a recurrent, worsening cough. Patients have a violent cough when they wake up early in the morning, a milder cough during the day, and in severe cases, an uncontrollable cough day and night. In severe cases, the cough is uncontrollable day and night. Sputum is not easy to cough up, and the sputum is white, sticky and foamy. There are no specific signs in the early stages of the disease, and dry and wet rales can be heard on auscultation of the lungs. Clinical manifestations and X-ray examinations can assist in the diagnosis of the disease. The prognosis for bronchitis is still very good. Patients with chronic bronchitis need to pay attention to avoid infections such as colds and flu and other upper respiratory diseases, and pay attention to strengthening personal protection in daily life to improve the resistance of the respiratory tract, which can effectively prevent the recurrence of chronic bronchitis.